Enhanced cross-shelf exchange by tides in the western Ross Sea
Enhanced cross-shelf exchange by tides in the western Ross Sea
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DOI：
10.1002/2013gl058207
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发表时间：
2013-11-16
影响因子：
5.2
通讯作者：
Jung, T.
中科院分区：
文献类型：
--
作者：
Wang, Q.;Danilov, S.;Jung, T.
西罗斯海是南极洲周围跨大陆架水交换的关键地点之一。采用数值模拟方法研究了罗斯海西北部海潮影响跨陆架交换的机理。研究发现，潮汐通过对公海暖水入侵的影响增加了高盐度陆架水（HSSW）的流出。残留的潮汐流沿着修正环极深水通道在岸上，因此加强了它的入侵。较轻的环境水使高压水槽附近的横流密度梯度增大，从而加强了高压水槽的出口。与此同时，陆上剩余电流和HSSW稀释的增加有可能降低出口率。由于反向潮汐效应的存在，强高压副海输出发生在中等潮汐强迫强度。跨大陆架交换潮的放大表明，气候模式应模拟或参数化相关的动力过程，以便充分预测海洋。
The western Ross Sea is one of the key sites for cross-shelf water exchange around Antarctica. The mechanism through which tides affect the cross-shelf exchange in the northwestern Ross Sea is investigated using numerical simulations. Tides are found to increase the high-salinity shelf water (HSSW) outflow through the impact on the warm water intrusion of open ocean origin. The residual tidal currents are onshore along the Modified Circumpolar Deep Water pathway and therefore enhance its intrusion. Lighter ambient water adjacent to the HSSW increases the cross-flow density gradient, thus strengthening the HSSW export. At the same time, the onshore residual current and increased dilution of the HSSW have the potential to reduce the export rate. Owing to the existence of opposite tidal effects, the strongest HSSW export happens at the intermediate tidal forcing strength. The amplification of tides on cross-shelf exchange indicates that the relevant dynamical processes should be simulated or parameterized in climate models in order to adequately predict the ocean.